Datasheet

AD7690
Rev. B | Page 9 of 24
TYPICAL PERFORMANCE CHARACTERISTICS
1.5
–1.5
0 262144
CODE
INL (LSB)
1.0
0.5
0
–0.5
–1.0
05792-025
65536 131072 196608
POSITIVE INL = +0.42LSB
NEGATIVE INL = –0.6LSB
Figure 7. Integral Nonlinearity vs. Code
80k
0
55
CODE IN HEX
COUNTS
05792-037
70k
60k
50k
40k
30k
20k
10k
57 58 59 5A 5B 5C 5D 5E 5F 60
0 0
39
1991
18
0 0
2614
67198
31666
27546
VDD = REF = 5V
Figure 8. Histogram of a DC Input at the Code Center
0
–180
0200
FREQUENCY (kHz)
AMPLITUDE (dB of Full Scale)
–20
–40
–60
–80
–100
–120
–140
–160
20 40 60 80 100 120 140 160 180
f
S
= 400kSPS
f
IN
= 1.99kHz
SNR = 101.4dB
THD = –122dB
SFDR = 130dB
SINAD = 101.3dB
05792-026
Figure 9. Fast Fourier Transform Plot
1.0
–1.0
0
CODE
DNL (LSB)
0
0.5
–0.5
65536 131072 196608 262144
05792-027
Figure 10. Differential Nonlinearity vs. Code
60k
0
CODE IN HEX
COUNTS
05792-039
50k
40k
30k
20k
10k
3231 33 34 35 36 37 38 39 3A 3B 3C
002
533
263
300
11212
VDD = REF = 5V
12623
53936
52500
Figure 11. Histogram of a DC Input at the Code Transition
95
96
97
98
99
100
101
102
103
104
105
THD (dB)
05792-047
INPUT LEVEL (dB)
SNR (dB)
–10 –8 –6 –4 –2 0
–130
–128
–126
–124
–122
–120
–118
–116
–114
–112
–
110
SNR
THD
Figure 12. SNR, THD vs. Input Level